<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <input type="button" value="设为红色" onclick="colorRED()">
    <input type="button" value="设为黄色" onclick="colorYELLOW()">
    <input type="button" value="设为蓝色" onclick="colorBLUE()">
    
    
    <script src="script.js"></script>
</body>
</html>